Hey there, I know your comment was to another user but thought I would help to answer. I’ve had mine since mid December and I still have it. It’s gotten a lot better…I’ve gone from 3 antihistamines a day to 1. If I’m lucky I skip a day but I will get extremely itchy at night. When I scratch I get the thick red lines and small hives. So I’m just about at the 6 month mark.

@mirzahasher, Hi sorry it took me a while to respond to you, but yes I am still having this issue. I'm currently taking cetirizine 10mg 2 tabs twice daily, taking famotidine twice daily, and also Singulair tabs. If I skip a dose I get very itchy and develop the hives right away.
Im going on 7 months with this issue and still currently have an elevated heart rate always in the 90s-100 rate. Hope that helps. Hope you are doing well.