Hello Everyone, I am 21. Male etc..

So I have been taking 12.5 mg of Metoprolol (break a 25 mg in half lol) along with Xanax and Lexapro for my anxiety. The Beta blocker was given because I was having heart rates of 140-180 lasting 2-3 hours at a time. I was curious if anyone else has had a similar experience.. or has tried a Beta BLocker for there anxiety.

I have been on it since april I am now noticing my heart rate climbing again. Could my body getting used to the drug?