DEAR DR. ROACH: I was diagnosed with rheumatoid arthritis (RA), but my rheumatologist hasn’t been helpful in finding a medication that I’m not allergic to for alleviating joint pain. (I seem to be allergic to most meds that I’ve tried.) I’m only 68. I saw the phrase “biological medication” for RA in one of your recent columns. What is this, and do you have any advice? -- B.R.
ANSWER: RA is an autoi…