Hi, I've recently started to take methotrexate for my arthritis and so as recommended I had a flu and pneumonia vaccine. The day after the vaccine I started experiencing severe pain in my pain and developed a rash and swelling on my arm. Also, I feel nauseas and just generally unwell. I was given antihistamines and antibiotics from the doctor but they don't seem to be helping. Could this be due to the methotrexate suppressing my immune system? Would anyone be able to give me any advice regarding what to do?