41 and sitting plateau for 6 or 7 weeks very frustrated

I am 5' 4" @ 160 I was doing great.... lost 27 lbs keeping 1200 cal diet and exercising 5 days a week. Now I cant budge the scale I even upped my cals to 5500 thinking I am in starvation mode. for about three weeks still not movement only few pounds up on scale. I am so frustrated thinking my hypothyroid is now to blame. Need some advise Please!

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