I'm sorry that you're having trouble relaxing.
The acupressure self-massage and meditation sections of the link below (to a page on SF) might help:
Self-Treatment and Miscellaneous
Acupuncture might help. This link (also to a page on SF) has some info:
Chinese Herbal Medicine and Acupuncture, World's Second Largest Medical System
I think it's been claimed that EMDR or CBT therapy can be helpful with PTSD, but this can be expensive unless it's covered by insurance.
In principle a massage therapy could help, but you'd have to be comfortable with the one giving the massage. Professional massage can also be expensive. Sometimes massage schools will offer a discount rate for massages.
There may be a simple massage technique that your fiancé may be able to perform for you.
1 Lie down on your stomach on the floor with your fiancé kneeling by your side
2 She can then place both hands on your back and gently rock you back and forth
3 After this, she could then "walk" her hands around your body
I hope something can help.