Here's a few..
Use your phone's recording device to document your thoughts if upset. This can also be done as and when the urge to get angry threatens your day. Surprisingly effective self therapy, listening to what you're going through, vocalized. Use until you don't need then delete forever.
Exercise. Just a little something every day. No routine, just do what feels right for you. At least 15 minutes to begin with, increase gradually over time. Very good for raising your mood, investing in your own self worth and helping self esteem. Also handy self validation as your fitness improves. You'll begin to feel more capable, stronger.
Long, relaxing baths. Candles, quiet music the works. Think about nothing at all. Helps take one's mind off the devastation for a while and recharge. Sounds silly but many people treat their body like a machine, auto pilot, especially following traumatic episodes like yours.
Buy yourself something, that's self explanatory.
Talk it out. If you've a trusted friend somewhere, meet up for a coffee and have a rant. Works best if they're pissed off about something too(!) Give yourselves a time limit, say two minutes each. Go back and forth for a few rounds.. You'll be crying with laughter (not anguish) soon enough. Also a good way of offloading without feeling selfish, mutual support.
I've heard Surviving Infidelity is a great site for those in your situation. Might be worth a look.
That'll do