What should I do? How can I fix this?

I had an ADHD episode. My girlfriend has been so patient and understanding. I told her I was going to self isolate and then dissapeared. She called and texted me every other day ( multiple times within the day) She was so worried I harmed my self or checked myself into a mental institute. I saw her calls and texts but I never responded until Valentines day. She was reaching out to me because she was worried but to also wanted to plan something special for us on Valentines day. When I got back to her on Valentines day I forgot it was Valentines day and I never said " Happy Valentine's Day" to her. She responds to my text, but I forgot and didn't call her until a week later. When on the phone she kept it short and quick and called me trifling for my behavior. I apologized saying sorry I wasn't feeling well and had norovirus for a few days. I contacted other people during that time but not her. She calls me the next day and tries to reach me all day but I don't respond. She breaks up with me through text stating " my behavior is very disrespectful and she doesn't deserve to be treated like this and this is the last straw she is exhausted and can't do this anymore". I never responded. She blocks me on all social media. I reached out to her sister to ask if she is OK. Her sister curses me out. Then she texts me happy birthday and I respond saying " Words can't express how sorry I am". How are you? She never responds and its been almost a month. I thought she would accept my apology by now , but im still blocked on instagram, tik tok and Facebook. I know I'm not blocked on her phone , should I call or should I show up at her house to apologize. She lives 30 minutes away. I didn't mean to do all that I did. Adhd is super tough. Everything has hit me thay we really might be over. I can't loose her. She was the best girlfriend I ever had. She was caring , considerate, loving, welcoming and all around a good person. I'm so devastated with the outcome of my actions.

Updates
1 y
I forgot to add that when she was worried about me and my safety I hadn't responded to her in 3weeks and then that's when she blocked me. It's been 3 months since I last saw her. I'm in this like paralysis where I'm afraid to call because of the rejection. I know she is upset and I owe her a real apology, but the way she has ignored me and the amount of time that has passed by she could have moved on already.
What should I do? How can I fix this?
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