Hey man, let me square you away on something. Don't just quit the meds because you want to fly. We ALL want to fly. But there is a SAFE way of doing things and an UNSAFE way of doing things. Cold turkey on the meds is not the way to do it. Cold turkey can and probably will cause things like seizures, stroke, and convulsions. That will open up another can of worms that will be reportable to the FAA, and will make it even harder to get the coveted medical certificate you are after. Show some common sense, and get your doctor to taper you off the meds gradually, that way, if you run into problems, it will be a quick and easy fix to readjust your dosage and keep you out of trouble mentally. If your doctor happens to be a quack, ( a few of them are) see another doctor for a second opinion, but take your FULL medical file with you for him to review. Do NOT try to hide anything from him, because if you do, I can promise you it will catch up with you a lot sooner than you think.
I can relate to your situation, but if you don't show some common sense in regard for your own safety on the ground, then it is questionable as to your judgement regarding safety in the air. Remember, one of the symptoms of being impaired, is not being aware of the fact that you are impaired. You can eventually get a 3rd class, most likely, but you are showing a lot of anxiety and too much anxiety is also disqualifying. Just take your time, you are in too big of a hurry. If you do it right, it could take you at least two years or more, but I think it can be done, as long as you don't make foolish decisions this early in the game and screw it all up before you even get started. I am not an AME or a doctor, but I have seen several cases similar to yours. I think if you get with a competent doctor you can work with, one that will work with you in a professional manner to help you achieve your goal, you can do it. But don't just up and quit the meds without professinal guidance. If you do, you can do irreparable damage to your brain that will ensure that you NEVER get a medical certificate. Do it the right way man. It can probably be done, but it will take time. I think, under your circumstances, that you will have to show no signs of symptoms for a lot more than just 90 days though. IMHO, I think you will have to be able to go at least 3 to 5 years with no meds and no symptoms before the FAA will even consider you, based on the numerous diagnoses you have. At that point, you just may have a shot at it. But right now, I don't think you have a chance this early in the game. Even if you go sport pilot at first, I think you will still need to carry a letter from your doctor with you when you fly saying that you are safe to fly. After carrying that letter with you while flying for 3-5 years, they just might qualify you with a third class certificate after you pass a battery of psych tests. Don't ever give up, but don't ever do anything foolish or unsafe, either. For now, just work with your doctor and get him to "TAPER" you off the meds, one at a time, and see how it goes.