Is this heartburn?!

Is this heartburn?

Hi, I never had heartburn before so I wanted to know whether I have heartburn or not. About an hour ago I got a tight feeling in my chest, and in my throat. Now the tight feeling is gone but I can feel a burning sensation in my chest. Everynow and then I burp and I can feel my throat burning. I am coughing a little as well. I am drinking milk already because I have no medication here to ease the pain. If this is heartburn is there anything else I can do or take to make the pain go away? I am taking Nitrofurantoin at the moment as well, could it be due to the antibiotic? Thanks everyone!

1 week ago
I am 25 yrs old. Yes I got the Nitrofurantoin because I have a UTI. I had some Chilli this evening around 7pm could that be the reason? But why would I get the heartburn so late? I realized when I bend over the tight feeling in my chest gets worse as soon as I stand up its better. So I really guess it must be heartburn, but I will go to my doc in the morning just to be safe.

1 week ago
I just read somewere to eat an apple. So I ate an apple about 30 mins ago and the tight feeling around my throat is gone. I still have some chest pain but its not so bad anymore, just a pressure like pain in the middle of my chest, behind the sternum. So just to let everyone know the apple helped.

i would also like to add that drinking milk will cause it to get worse in the long run. it will calm it down now, but it will make it worse after awhile. also pepcid AC(chewables) works for instant relief and will last for around 12 hours or so.