Yeah, go to the hospital assuming you have an affordable deductible. If you don't and the problem persists until tomorrow, go see a doctor, affordable or not.
I remember mudding once with someone on the chat side-channels saying they'd got a nose-bleed that wouldn't stop, and we spent a long time trying to persuade them to go to A&E/whatever. Whatever people say about the NHS, worrying about the existence/details of personal insurance doesn't play a part in my life.
I tend not to go to A&E because on the rare occasion I've been in agony with something[1] I've assumed it'll get better. Obviously, so far this has been right, in this particular version of me.
But just because I'm still around to have been correct about this, doesn't mean that this is a good example to follow. For something like that (although generally heart-attacks chiefly involve the left-arm tingling, IIRC, but there's various thromboses as well, and could lead to a stroke if it's a small clot and it moves to the head (again IIRC, BICBW!)), while the medical system may end up failing you utterly, and it may not be able to prevent what is going to happen from happing, at least you
are closer to people who might just be able to diagnose and treat any further complications, rather than sitting in your flat/wherever, staring with cold, dead eyes at whatever internet feeds you had previously set to scroll across your screen.
Just lifting the mood there, ok?
(I won't mention MRSA, C. Dificile, or other problems you could pick up
in a hospital, however. Oh, I just have.
)
[1] e.g. sneezing so hard, from hay-fever, that I feel like I've cracked a rib, although it was probably just a strained muscle on those occasions.