Sadly, this is definitely normal (especially the PTSD suggestion).

In the book "20 Years Gone" by amateur author Dorian Wright (available at Amazon and Google Books), they recount the experiences that they had while discovering their ex's alternate life, and the toll that it took on the author both during the discovery, and, after.

Alot of the pain does start to fade over time, but sadly, alot of the triggers remain. It's managing those triggers that, in my opinion, are key. For example, anniversary or birthday dates of the ex- it helps to do something fun for yourself, or buy something for yourself, on those days, to help put them behind you.

Most people who got married invested 100% of themselves in their significant other. And when that person is gone, it's hard to just edit them out of your life.

Keep moving forward, remember that you are still healthy, and have life to live ahead. Take trips. Watch new movies, listen to "The Message" on Sirius XM or even "Shine FM" if you have access to it. There IS a path forward!!