Well I can't necessarily avoid it because it's made quite often in my house. And I already avoid dairy (that's actually the biggest trigger for it), gluten, and most pork (bacon being the exception). If I were living on my own things would be much different.
Ok I just want to chime in to say that if your family is neglecting to take care of you on something as serious as your health and diet, it is time to get in people's faces and be demanding. If they are going to only give you food that makes you sick, then they should provide the medicine to treat it as well. It is not your responsibility to suffer in silence just so you don't upset the rest of your family (especially since they're all older and should be more mature than you).
If your family is unwilling or incapable of dealing with this, seek help from your church family.

