I had the same issue! Of course a doc needs to diagnose you and, sounds like you're probably visiting your doc as soon as you can. I'm not a doc however here is what happened to me.
I had numbing and tingling in my left arm for parts of both my entire pregnancies, which then turned into shortness of breath and chest pain. This almost always happened to me while lying down - so usually in the middle of the night. The only other times it happened, when not at night, I realized later was after eating something like fast food. I had extensive tests done to check my heart, ekg, etc. even wore a holster to monitor my heart at night. My bp was normal up until delivery where it was higher (but only with my 1st delivery). However, keep in mind high bp usually isn't associated with any symptoms as far as I know - I don't think you feel pain/tingling usually.
Anyway, after all the testing, it turned out to be a very bad case of acid reflux. With very bad reflux cases, the symptoms feel like a full on heart attack. We later discovered that the prenatals were causing severe acid build up in my stomach (and anything I ate that was acidic - coffee/tea/juice/fast food, and as far as the vitamins - even anything enriched, like enriched cereal which has added vitamins, and enriched bread ALL affected me. needless to say I really had to trim down my diet, and cut out a lot of things, even the prenatals -- again, not saying this is what you need to do, but this is what it was for me. I even tried kids chewable vitamins, and liquid vitamins - everything gave me bad reflux and this is the way it manifested in me. I could take the vitamins, only if I took prescribed rantidine (kinda like prescription tums), but I really didn't want to be taking that daily just to take the vitamin, so I just tried my best to eat super healthy. My kids turned out healthy thank God. Anyway, it made sense that it was only at night in my case, b/c the acid would seep up my esophagus and cause the reflux - and severe reflux actually can feel like a full on heart attack - we even called 911 in 1 case b/c I seriously felt like I was having a heart attack and couldn't breath - but yet my vitals were normal when paramedics arrived. Anyway, that's what did it for me. Of course, not saying to cut out the prenatals, which I had to do, but I would cut out all enriched/processed foods. I had to eat organic only, esp. pasta/breads. Avoid juice which is super acidic, and coffee/tea. Sounds weird, but it did the trick for me. And this even continued after my pregnancies, and I'm only now - 5 years later...somewhat back to normal. I would discuss the possibility of reflux issues with your doctor. Good luck!