Horrible upper back pain??!! Help?

So I’m 28 weeks, and lately I’ve been getting this really strong pain in my upper back. Like I mean, gasping for breath, unable to move kind of pain.

It’ll sometimes also spread to my upper abdominal region but most of the focus is on my upper back.

I’ve noticed this happening at least once a day, sometimes 2 or 3 times. It’ll last anywhere from like 3 minutes to maybe around 10-20. Although I’ve never actually timed it. ( a little too busy trying not to cry).

I’ve read it could be the baby pushing around at my rib cage or something but I can usually feel him moving around in my lower belly.

I’ve noticed heat helps a little but only very temporarily.

I don’t have my next appointment to see my doctor until much later this month but this is really killing me. Anyone else going through this? Any idea what it is or what to do about it?