Many people complained of breathlessness and palpitations affecting sleep after an mRNA shot. One of my frieds had palpitations daily for 6 months after his first shot of Pfizer in 2022, was referred to National Heart Centre where all kinds of tests were done without any conclusive findings.
Now many cohort and retrospective studies have shown that these symptoms are usually due to post-vaccination myocarditis (inflammation of the heart muscle), which causes irregular or rapid heartbeat and reduced pumping action causing shortness of breath. Post-mortem studies of COVID vaccine related deaths also show the same findings.
Don't do mRNA, is my advice to you.