MCAS and ssris (citilopram)

I have been on citilopram for 17 years low dose 10mg I have encountered a MCAS flare post viral in the past but it soon went away. This time post viral i was in a flare I went to my phycastrist appointment I was removed off citilopram abruptly I have been in a flare for 7 months never had a flare like this. I reacted to lithium but they don’t understand MCAS. Could the withdrawal from citilopram be keeping me in a constant flare. I have tried to retake citilopram with my left over medication I had before hand and I am now reacting to it. Any help atall.