Is it excess stomach acid?

Since two days ago, I have been experiencing mild upper abdominal pain and heartburn in the early morning, which disturbed my sleep. So yesterday, I went to bed early, but similar symptoms appeared again, causing me to wake up in the middle of the night and sleep in late. It wasn't a stomach cramp, but the heartburn was severe enough to interfere with my sleep. Should I go to the hospital? I had a polyp removed from my stomach during a health checkup, and after that, I experienced significant stomach pain for several days.

I got better after a while, but could it be because I drank a lot of coffee? (Actually, I really love coffee.)

Will taking something like Gelfose from the pharmacy help improve the condition?