Veggy, you can always tell a doc that you did it yourself. They have sworn to keep their mouth shot. It scalled medical secret.
Now, I donno how things go in America but in case of infection, take the most sterile bandage you can find, a desinfectant such as dakin cooper or an iodine or eosine stuff, it can be either liquid or a cream, which is better, and change it 3 times a day. If you see its red around the wound and yellowish and swelling inside then you must take antibiotics either by putting antibio cream on the wound or swalling them or both. Forget about the stiches, its seems too late at this point in time.
Ok, its gonna be an ugly scar but you can avoid it by using silicone plasters such as cicacare or dermatix.

I know its easy to say "dont do it again" so I wont. My only advice is to handle the blade better and to avoid to be in such a mess.

BUT dont do it again, please, I stopped for more than a year and dont miss it after my last dramatic infection. At least you seem to have done it that in a clear cut with a clean blade. Nevertheless, your anxiety about it may be a good reason to quit this disastrous habit.

Lots of hugs, take good care of yourself and go to a doc, its the best thing to do.
I wish you all the best.