I had that and severe swelling! It was awful! It also started affecting my thyroid. I was taken off of it after 6 weeks. I gave it a good college try but just couldn't handle it. Definitely call your doctor that prescribed it and tell them. If you are going to the ER then I wouldn't definitely be thinking about getting off of it. However, you probably need to add a new BP med before completely stopping. You don't want to have a depressive or manic episode.

Hugs