PTSD after infidelity

My husband and I hit a really rough patch, I was a SAHM for mean years but my husband got laid off so i went back to work. Work was HELL and it complete took over my life! We worked opposite schedule and I was beyond physically emotionally and psychologically drained by the time I left work. I worked at a big vet clinic and I loved my work but I missed so much with my son and husband. We became so distant partly because he didn’t want to hear me bitch abt my day. By the time I got home in the evenings he was leaving for work. This went in for 4 years one day he had holiday plans (I was working) and was planning to take our son. As he was getting in the car he told me we needed a break and to leave him alone till he decided what to do! I was a basket case. I know now I wasn’t giving him any attention including sexually. We got past it . i was try to make a lot of changes and I though everything we getting better. One night I planned some

Kinky sex and it was great. Right have he fell asleep I noticed his phone going off a few time and I learn over as saw it was one of the moms from our soccer time (my husband was the coach) also keep in mind that it’s 1am. I opened the txts and sure enough I was filthy messages. He clearly had deleted most of the convo but it was pretty obviously! I lost my fucking mind! It’s been 2 years and we really have worked a lot of things out, I’m also back to being a SAHM so my time is totally devoted to my family. But small things on tv in music ect. Put me right back to those feels of RAGE and insanity and I can’t rationally get though it. I’m cry scream break stuff pick fights ext. is PTSD for infidelity real? I’ve tried numerous ways to cope. Sometimes it works and sometime I’m to far gone. What should I do?