Should I go on a relaxing Vacation to get away from my own personal problems for 2 weeks at a 5 Star Hotel?

There's no need to do anything so drastic as taking that vacation that's going to set you back or taking Valium. It's time to re-evaluate you life & try to fix it, so you can feel better. It sounds like your Partner was rather selfish & didn't talk things out with you. Talk things out with your Partner. Stay calm & say "I feel...". Don't say "You make me feel..." (that puts the other person on the defensive). Do some nice things for yourself...eat a healthy diet, get enough rest, do yoga, exercise, take a relaxing bath, read, listen to music...whatever makes you feel good. With the nicer weather you can go bike riding or enjoy nature. After your talk with your Partner, hopefully things will be better & you can forgive your Partner's need to get away without you & the two of you can move on. Plan some nice little outings together, like a picnic or movie night. I hope things work out.