I googled the conversion tool. It looks like about a 430 on the 3-digit score. I agree with above poster. At least you passed. Of course try and do better on Step 2.
The competitiveness of anesthesiology may be waning again, while as far as I know the number of spots available is not projected to decrease. In case you haven't been keeping up on current events, Medicare is notoriously unkind to anesthesia, and healtcare reform is expected to follow in Medicare's tracks. Furthermore, Blade is discouraging people from entering the field. So do not be deterred from applying. This could be your opportunity.
I don't know exactly which programs to apply to. In looking at ACGME programs, search their resident list and apply to programs that already have DOs. If you feel better having internal medicine as a backup, you can still rank all your anesthesia programs ahead of medicine to ensure a match somewhere. I wouldn't rank any DO medicine programs, since matching there would exclude you from the ACGME anesthesia match. Use ACGME medicine programs as backups. Also, see if you can just match into internship-only medicine programs as backup. Then (if necessary) you can apply outside the match for CA-1 spots while you're a medicine intern, without having to be secretive like you would if you had matched to the entire residency. If nothing seems to be working out at that point, you can see if your medicine program will extend a full residency to you, or look elsewhere. Owing to the vast number of medicine spots out there, something should be available. (Odds are, some medicine interns will not finish the year, and their program will need to fill their residency slot).
In short, if you want to do anesthesia, go for it. You have your work cut out for you, but if you step up your efforts and match, it will put you in good shape to get through your post-graduate training.