What's wrong with my beer

I bottled my porter two weeks ago. I tasted it after the 1st week and it tasted awesome. The head had nice small bubbles and the carbonation was pretty good for only one week. I tasted it today and I noticed after I poured it the head had bigger bubbles and disappeared quickly. It tasted decent but with a burning carbonation feel to it. Did I over carbonate or is something else wrong. Also halfway through the beer I would swirl it in my glass and could not get some head to form. Can someone drop some knowledge on me and let me know what they think and what to do.

Have you just opened those 2 bottles? Maybe the most recent sample just didn't carb properly?

I'd open another bottle and compare.

It was my third but my first and only at the two week mark....but assuming all of them taste that way now what could be the problem?

Bug bubbles and a burning sensation sounds like an infection.

Your beer is fine. Patience.