Should I stay or go?

I just randomly quit my job today. I quit because I felt bad for calling out so much lately last month and being sick that I felt my boss should hire someone else. I told my boss I have not been feeling well mentally and physically. She could me a bit ago and told me that she values me as an employee and would like me to stay and she would can work with giving me part time for as long as I need it. She told she would give me a day to think of it. I really enjoy my job but now I feel embarrassed to go back because I collected all my essentials this morning in my office and did not say goodbye to any of my collegues. I feel to embarrass to go back. What do you think. Is it worth the emabarassment? I have a nitch on what I am going do but just wanted to hear your thoughts?