I Went Walking About An Hour Ago. I Went 2

I went walking about an hour ago. I went 2 miles. My heart is still racing. It go as high as 181 when i finished the walk. It is now 144. I am 72 years of age and my weight is 298.6 I also found out this morning that a very close almost 18 year close relationship is probably done. I have put on a lot of weight in the last 3 months. Up until January I walked almost everyday at least 4 miles with no problem. I have not walked since.