Contact Your Plastic Surgeon.
If your strap is killing you after Implant revision surgery, you should call your plastic surgeon. The strap may be removed, or your plastic surgeon may want to check you in the office. It might be something other then the strap that is causing your severe pain.
Tape is hurting
It appears from the photos that you have supplied, that the surgeon added some tape to the capsule repair on the right breast. We use this technique as well with this type of surgery. The tape should not, in my opinion, be so tight that it hurts. Go back to your operating plastic surgeon and asked them if the tape can be revised so as to not hurt. Good luck.
1 day post op. Revision and using breast strap
Congratulations on having undergone the revisionary breast surgery. In general, bras or dressings are not meant to be uncomfortable or "kill you"; garments that are too tight may be problematic for many reasons. Best to address your discomfort with your plastic surgeon ASAP.
Best wishes for an outcome that you will be pleased with long-term.
Usually a breast strap after surgery should be snug but not unbearable . I would check with your surgeon for instructions .
1 day after breast revision
Is that an ECG electrode that I can see, still on your chest? That should have been removed before you left. It is not a big issue, but it may be making the band even more uncomfortable, if there is pressure on it. Unfortunately, I cannot give specific advice about the breast band, as post op instructions are different from surgeon to surgeon. You should definitely try to get in touch with your surgeon for advice.