You are not a jerk. You are having a hard time both in trying to deal with your mental health issues and in the grief process of coming to terms with your break up. I don't know what exactly you texted her but when having a rough bout it is natural to reach out to those who we feel closest to...it is hard..I know..I'm having a rough time too..It's impossible but I know how it feels all the oxygen gets sucked outta the room and you just want so badly to go back..back to that person place and time when last you remember feeling cared for ..it happens. Just explain and apologize for whatever triggered her..if she truly wants to try to work thru the break up and towards a healthy friendship..I'm sure she will understand...give it a little space and when you are feeling calm and able text an apology and explain what you were feeling at the time and that you still really want to work thru this with her you are in treatment and do understand and want a healthy friendship. Now breathe!...it will be OK

As for the Valium..
Valium is an anti-anxiety medication in the benzodiazapine (sp?)...class. like any other med it depends on the person how they will respond to it. If it is agreeable to your body/genetics..and at the correct dosage should be very low..it is a very mild sedative. All benzos can make you drowsy or groggy or impair your judgement...if it is the right med at the rughyt dose it should not or very little side effects..it should just calm the anxiety and help keep it in check. The first few days take with extreme caution! Because it may have a greater effect at first if you have never taken it before. If you feel "drugged" (groggy, foggy, drowsy, out of it, underwater, falling asleep) at all after a few days..talk to your Dr about stitching to another med or adjusting the dosage. Like it says on all labels **do not mix with alcohol or other drugs. And do not drive or operate machinery until you are used to the effects! **

I can not stress enough...if you feel off talk to your Dr!..
I have been on a benzodiazapine (in the same family as Valium) for almost 10yrs I think now! And I if I take it at bed time it does usually help me fall asleep.. but not knock me out..and if I take it during the day for panic or anxiety attacks it just calms the mind of anxious thoughts and helps stop the physical sensations but I don't feel the med it's self. It should when right be like taking Tylenol for a headache.
But the wrong med...man! I was once given the lowest dose made of another med in the same family and it Knocked me out Cold for like 15 hrs! I woke up and my phone was still in my hand! I dissociate (lose time) so at first thats,what I thought maybe had happened but the nurse can in and told me how long I had been asleep! So BE CAUTIOUS! you should know pretty quickly how it effects you..
Also last Caution..**Benzos are potentially addictive! And absolute HELL to detox off of if you have been on them for a while! ***
While I am not addicted to my med. I am dependent to it. I don't crave it. I don't abuse it..I don't even take as much as prescribed most of the time..but I have to keep a minimal amount in my system. If I miss a day and a half or more...I start feeling awful. Like sweating shaking can't breathe start freaking out occasionally I have had mild hallucinations without it...and if I tried to get off of it by now I would most likely suffer from tremors and possibly seizures for the rest of my life...staying on it..one way ticket to early onset dementia which I am genetically at risk for anyway...but the seizure thing is particular to only the med I happen to be on I think?..but..sorry for the rambling my mind is just not focused right now...long and short...take with caution for short-term if possible and hopefully it helps and you can find other ways or a non-addictive med to replace it in time
-lost