ykim768, let me try and answer/give you advice as best as I can.
I've been pretty ill from a panic attack on an MDMA+Ketamine+Nos combinationI was okay for a few weeks after but then I took a turn for the worst. I've since been suffering from depersonilisation and derealisation disorder for exactly 7 months to this day. During this time I have spent a lot of time researching HPPD as I have been convinced that was my problem until I found out most with DP/DR suffer some similar visual problems to those with HPPD but on a much more milder scale and only really includes things like visuals snow, light sensitivity, floaters and afterimages etc. At this point im pretty convinced that I dont have 'true' HPPD but I still understand how scary it can be to suffer from such visual problems. My main problems are visual snow, which I only see in certain lighting conditions and against certain backgrounds (90% of the time I have to actively look for it), afterimages from bright lights and occasionally text (this does not bother me most of the time), occasionally floaters, and sensitivity to bright lights/outside/starbursting from car headlights.
Out of interest, what do you mean by 'I see patterns'?
Okay so heres what I can tell you, unfortunately not much is known in regards to HPPD so its likely you'll get conflicting advice and stories, but what does seem to be common is that any drug use makes it worse! So you're on the right track by not using anything else. Also, most with HPPD benefit from exercise but some claim it makes visuals worse for a short while afterwards. Dr.Abraham is one of the leading researchers in HPPD so it's worth looking at some of his work. Around 50% of his patients made a slow but full recovery over a 5 year period. He has stated that recovery can still occur after 5 years so please do not feel discouraged by this. He has looked at various medications and there still isn't anything available that cures HPPD but there are medications that help. Clonazepam(klonopin) is the main medication used and is widely successful, although obviously comes with the dangers of benzo use but I Imagine that would be better than living a life with constant visuals. Some HPPD suffers rotate their klono use (e.g. fri/sat/sun -On Klono, others days off) to avoid potential addiction and tolerance issues. Other medications worth looking at are dopamine based medications such as sinemet or keppra.
In regards to the worsening of your symptoms, this isn't common for HPPD suffers (unless they carry on drug use) but isn't unheard of and I have read of people saying their HPPD worsened over a period till it reached a baseline and then it didnt get any worse. This is when youre likely to start recovering if not before.
What I have learnt from forums and around the internet is that a large percentage of those with chronic and persistent HPPD is that they learn to live with it and live somewhat decent lives. My advice to you is to wait for as long as possible before trying medications to see if gets better on its own, and in the meanwhile do all the normal things you can do to stay healthy; exercise (cardio and weightlifting), healthy diet (I recommend a diet high in plant based foods), drink plenty of water, practice good sleep hygiene, reduce anxiety/stress as much as possible etc
As I said little is known about HPPD, so its impossible to say when and if you will recover or get better or get worse. Nobody knows, but that doesn't mean you shouldn't stay positive. There is one guy who's HPPD is so bad he can't even look his wife in the eyes without the rest of the room disappearing, when he looks at his white cat all he sees is two eyes! And he says everyday is still somewhat of a battle but....he has his own business, he is married, and enjoys things like surfing and playing football. He also said for the first couple of years he barely left the house and was pretty much suicidal, but eventually the depression went away and he left England on his own to live in Portugal for a 12 years. There is always a light at the end of the tunnel...no matter how bad it seems at this current moment.
Hope this helps you and if I think of any other advice I let you know. Feel free to PM at any time.