Methotrexate side effects


Recently my methotrexate dose has been increased from 15mg to 20mg and I’ve found I’ve been suffering from severe frequent migraines. I have spoken with my rheumatologist who said this might be the cause but it’s not common and the only way to find out is to decrease my dose and see if it helps. Trouble is they aren’t normal migraines and can cause my to black out but I am worried about decreasing my dose as I don’t want a flare up. I have had loads of tests done including a head scan and it’s all come back clear. I am just wondering if anyone else has experience this whilst being on methotrexate or is it likely to not be the cause? I am still under investigation by my GP but wanted to ask if anyone has any experience with this at all? Thank you :)