I have been living with a condition which makes me weak and get sick from even walking, I'm really annoyed by taking so much medicine and I just need to know how the immune system works, are there any ways to improve the immune system? If so, please share this info with me. Thank You

I would definitely get checked out by a doctor. You just never know all that could be going wrong. I thought I was fine and ended up on Synthroid offshore pharmacy due to an undiagnosed thyroid problem. MIght be a good idea to get checked out.