how do i cope?

hey ladies, my boyfriend is currently in rehab right now for violating his probation. i won’t go into details on how he got there and what he did but he’s now in there a max of 3 months. its only been two weeks and i’m falling apart. i’m super depressed, i cry everyday, i can barely even have the energy to get out of bed. he isn’t allowed phone calls (family only) or visitation (family only) from me so we only have to write letters. hes currently in a rehab that is a half hour away from my house but waiting for the letters feel so long, i just feel like he’s forgetting about me (that’s probably not true, i hope). i’m just a mess how what i’m asking is how did you ladies with a man in jail or rehab cope with this? he went away before only for a month and that was when we first started dating so tbh it didn’t really impact my life as hard as this now. i sleep with his sweatshirt, his picture on my nightstand, and a necklace he brought me before he left with his initial on it. is there anything else i can do ? please any advice i would love.

thank you ladies☺️

edit: i am happy he is getting the help he needs and everything and i know this is important but not being able to talk or see him is still hard