Welcome to the forum! Yes, I hear you loud and clear and you hit the nail on the head as far as building your immune system and detoxing. By detoxing you are building up your immune system and the ways to detox are endless.
I feel the best immune boosting supplements are the natural ones and there are many. I come back to post because I really enjoy helping others since I am have been well for almost 4 years now. In my case, I didn't see any doctors, I used a protocol from a book and did it all from home after trying different regimes.
I also became my own advocate and it's such a joy to be all better! If you want more information you can also e-mail me.
Good luck to you,