26M, My pulse is really low (54bpm) after taking 25mg of Atenolol for really high blood pressure. I’ve been feeling shortness of breath and side head pain. Am I going to be okay or is this not normal?

Male 26 I take 25mg of Atenolol for when my heart rate gets really fast and I also have 25mg of Losartan for my blood pressure I was taking last year after also having really bad hypertension episodes due to what I suspect was an allergic reaction to contrast from CT. The past week I have had pretty low/normal blood pressure which is new for me after having had a really bad hypertension episode last week where I had to go to the ER to make sure I was okay since the numbers reached 170+ over 100+, it went down in the ER slowly, the nurse said she thought I was anxious and her daughter had anxiety so she was going to give me something for it which I think she said was prescribed. The nurse gave me anxiety medication and I fell asleep, but when I woke up my bp was pretty low for me (101/56) if I remember right so I was freaked out, but everything they did before that came back okay so I was basically okay to leave. After that my blood pressure has been pretty low for the most part. I had a lot of trouble sleeping and would barley sleep or stay awake all day which could have contributed to the hypertension episode, but I’ve been sleeping a bit better and have kept my bp low which makes it hard to know when to take my Atenolol since my pulse is also low. Today after eating this morning my bp and pulse suddenly spiked really high for me (179/100+) and bpm got up to 133+bmp so I chewed the 25mg Atenolol and then also took the 25mg Losartan to see if it would lower, it was lowering faster than I expected even though it took a while. Fast forward to two hours later where I stated to feel chills and shortness of breath, I take my bp and see that my pulse is in the low 60s then the second time I take it, it’s at 54bpm. It’s never this low, and I’m worried and confused since it was high to warrant me taking it. Should I be worried?? I just finished eating so I think it’s not as bad, but I also feel really tired right now, I’m not really sure what to do or feel, I’m afraid to lay down.