Re: Where do I begin???
Welcome Shakdwn96. It is worth having thyroid blood tests to determine if this may be causing your overactive pulse. At a minimum, the doctor should check your Free T3, Free T4, TSH, and Thyroid Antibodies.
Some folks find they gain weight when their thyroid levels are low, but we're all different, and others gain weight as an indication of thyroid imbalance (whether it's low or high). Many folks find that they are unable to gain or lose when their thyroid hormones are not at the level that's healthy for them. Perhaps that's what's happening with you right now.
If you've not already done so, you might find it helpful to read through our Stories thread and Information Archive:
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Let us know what you find out.