TNF suppressants... how dangerous!?

I've tried every ASA, 6MP, even antibiotics and probiotics, and am still in my 6th month of flare-up... I'm really young and afraid that letting this go on too long not treated properly will have really bad repercussions, but I am afraid to start my doc's recommended course of Humira/Remicade because I feel like I need my immune system to stay strong, especially as I volunteer often with folks who don't get regular health care and am currently living in poor commune living conditions (a bunch of teenagers together in a house...). What are the risks of starting this medication or not starting it? How can I best preserve my health? Help, some wise forum people... help...