I had issues with lightheadedness while on methotrexate. Saw every specialist they could think of since that is not a side effect of the drug. All their tests were negative. We finally decided to discontinue the drug and I feel so much better. However, the methotrexate did get my inflammation markers to be normal for the first time in years. Getting labs next week and hoping my numbers are still down. Still on a low dose of prednisone, slowly tapering down.
Hope you get some answers and feel better.