I agree with Konnor's idea about talking to your GF about it.
And also like Konnor, I don't really have any ideas on how to deal with your dysphoria. From what I can tell, it seems like dysphoria hits all of us differently. There's not really a cure-all for it, and unfortunately, there's no telling how long it's going to last. I don't deal with dysphoria constantly, but I do have my fair share of it, along with a lot of anxiety when I'm in public - it took me years to realize that I was having this anxiety and panic attacks due to my trans...uhm..ness. Now when I have issues like that, I do things that force me into feeling more 'manly,' maybe it's lame, but it works for me.
If you've got a therapist, you could always ask them if there are medications that can help with the dysphoria that you're feeling. Even if you don't ask about meds, it might be a good idea to look into a therapist (if you don't already have one,) since you've admitted to having suicidal thoughts. Thoughts like that are really hard to get rid of on your own.
I wish you the best! Keep us updated on how it's going!