Well hello, I was addicted to tramadol for 5 years although in a recreational manner. So, tappering off slowly is a very nice and gentle option mainly if you are physically addicted because it tends to ease the withdrawal for you a lot! Although if you are psychologically addicted too, that problem must be solved ASAP by yourself in your head or with the help of a psychologist before you reach the end of the tappering so you won't be tempted to relapse.
Your dosage is 280 mg of tramadol (8x35 mg pills), I would say not to rush it and give it time so start by cutting off a 35 mg pill a week ( you can wait even more than a week if it is more comfortable for you, it depends on how much and how often you can buy them from a pharmacy). Hell, you can even try to cut off half of a 35 mg pill per week, yes this will prolong the tapering process but will really make it comfortable with you. By this method,opposed to cold turkey, you will not feel withdrawal symptoms or maybe a little. So now I will suggest you some things if you do experience minor withdrawal symptoms (don't be scared by this, tapering of this slowly you will really affect you maybe a little) : Immodium (loperamide for diarrhea) , a mix of vitamins ( you can find a bunch of this stuff, just try a brand that has a lot of them maybe some 5-HTP in it and stuff like that) so your body receives the strength needed as it consumes a lot of energy trying to get you off, 3 meals a day at least ( if you eat really little as me you can always eat very little portions of food but more frequently, so remember or 3 nice fat meals or more frequent little meals), I would suggest a lot of physical activity ( maybe a couple of walks, or if you have some sports as a hobby even better).
For the anxiety part I would not be scared as you have the diazepam which will help you a lot with this fight you have to deal with! as for the depression please don't take any anti depressants or stuff like that because you will just get hooked on them ( but you probably already know this) I would say to wait a bit after your taper is finished and try some maoi type of action tea that is available otc anywhere ( but I recommend this kind of maoi natural stuff only after at least a week is gone after the taper is finished because it could provoke some dangerous side effects).
Sorry for the long post, and I hope that I provided you with all the information you need to successfully win this battle! I only won the battle with tramadol and other opiates just after going to rehab but this was to the fact that I was equally madly addicted psychologically not just physically so although my wd symptoms were gone, my cravings were not so I had to be isolated from any kind of access to them! Anyway whenever you feel depressed, you need some advice or you feel like you are gonna give up feel free to PM me and we will try to work this out for you.
Much love, take care of you and keep us updated,
Morpheus