Drlovegrove, it appears your question got lost in the fray of the discussion. You asked "What happens if you stop taking Methotrexate abruptly?"

According to this Q&A, "There is no problem with stopping methotrexate abruptly, with the exception that you might flare if you indeed have active ongoing RA. Talk to your rheumatologist."
https://www.hopkinsarthritis.org/ask-the-expert/stopping-methotrexate/