The best thing you can do is to let your doctor know if the medication is not cutting it.
There could be several possibilities. You might not be on the proper medication for you. Your dose may not be the correct dose to work on your pain. Its best to just let the doctor know that you are still in a lot of pain.
IME I tried several medications before I got on a combination of medications that work well on my pain. That being said, I still am in pain and will always be to some extent.
I have had doctors give me medications they knew were not going to work so to get prior authorization from the insurance to write the one they wanted to. I had to try about 3 or 4 different medications just to get my insurance to pay for the prescription I am on now. Along the way a few of the medications were absolutely useless and they pretty much told me that would be the case.
It takes while to get your dose and medication proper. Its very annoying as my pain came on pretty much instantly, but to relieve it, its taken literally years. It has definitely caused me some distress and held me back in life. I am surprised someone suggest that you abuse your medication. I can tell you right now that abusing your medication will only make it not work for you in the long run. Its a very bad idea.
If its a dosage issue and the doctor caps you off, you can get a second opinion. That's what I did. The clinic I am at is a lot better IMO. The apts. are rather quick if you schedule them at the right time. The staff is rather compassionate. I guess I felt like the doctor I had before didn't give a shit about me suffering and wouldn't up my dose even though I was struggling in school due to my pain. Well you never really speak to doctors, its always physicians assistants, but still the last thing you want is a PA who doesn't give a shit how people feel and just want to process you as fast as possible.
I had one PA and every time I would want to discuss something, he would say we could talk about it the next visit. That was very frustrating as you go in every two months and you have some concerns you want to address and basically the PA tells you he does not care and is too busy to have a five minute conversation. I'm thinking at a doctors apt. that they should actually speak to you and not just have you come in wait 3 or 4 hours to just get handed your RX and leave without speaking to a doctor or PA for more than 30 seconds. Its one thing if you tell them you are fine, but when you say you are not fine, well they should address the issue.
I digress, its a process. Its a long one and its not comfortable. I had failed to mention that sometimes when you switch medications that you may go into a bit of withdrawal from the last medication and the transition can be a bit rough. Its usually not pleasant to switch medications unless you are going onto something stronger. I find switching medication families can be a bit rough. When I switched from Morphine to Opana I got quite ill. It was not a pleasant transition. But in the long run it worked out better for me. So like I said its a process. Its a bit trial and error and some of the stuff just takes time.
I would address my concerns with my doctor (if you are actually lucky enough to have a doctor treat your pain) or PA. Just tell them your pain levels, and the things you are having trouble doing. You are only 4 months into CPM and it sounds like you are getting to try a lot of different medications rather quick and that is good. It really does take time and communication.