Weight gain?

I’ve been dealing with unexplained weight for a few months now. It correlates with my onset of chronic urticaria. I’ve also been feeling much more fatigued. I’m not eating any more than my usual, I tend to lose weight easily and I’ve only gained. In five months I’ve gained 12 pounds which is highly unusual for me.

I’ve been experiencing water retention and bloating which is also unusual.

Wondering if anyone else has experienced this?