Doc adding Hydroxychloroquine to my Remicade - anyone else on that?

I am pretty well controlled with Remicade for 6 yrs after cycling through Methotrexate, Humira and Enbrel over the previous 6 years. I’ve recently had a few more flares than what is normal for me and he wants to add Hydroxychloroquine. The side effects sound dreadful. I particularly hate GI side effects.

What am I likely in for?