Moved to Relationships category.
I recommend a bit of kitchen witchery - simple and very powerful:
Get amaranth flowers, which have the magikal property of forgetfulness, mixed into a poppet that represents the obsessive part of the relationship. Make the poppet out of edible wax, like white chocolate, lard, or coconut oil if your climate is cool… Bury it, knowing that by the time it’s been degraded or more likely eaten, that link will have gone. As your will so mote it be.
I like to listen to Three Days Grace "I don’t care’, but that’s me, music can help you put the right energy in. Be careful not to overdo it, I’ve cut off more than I intended doing this before… I was upset and the extra emotion did it. (Caveat: I’m very good at suppressing/destroying/sublimating my own emotions, this probably didn’t help.)
Add lavender for healing and any other spices and herbs you feel would help. 
Hope you feel better soon!