MY DOCTOR DID LABS ON ME AND THE CAME BACK

MY DOCTOR DID LABS ON ME AND THE CAME BACK POSITIVE FOR RA AND SLE..MY dsDNA IS 185 AND MY ssDNA IS 193. HE TRIED ME ON HYDROXYCHORQUINE AND I HAD A ALLERGIC REACTION. HE NOW WANTS TE TO START MAETHOTREXATE INJ SUB Q 25MG/ML QWEEKLY. JUST HOW DANGEROUS IS THIS MEDICATION? I USED TO WORK AT THE CANCER CENTER AND THIS SEEMS TO HAVE THE SAME SIDE EFFECTS AS CHEMO? I NOW WORK AT AT A GASTRON CLINIC AND AM ALSO CONCERNED ABOUT MY LFT'S.