That’s big weight to be benching at your body weight mane. Unfortunately from what you’ve said it sounds textbook pec tear. The question isn’t “what if?,” anymore it’s “how bad?” and “what next?”.
Firstly do whatever you need to do to go see someone who gives a shit about you even if you have to go around to all the GPs in your area or travel an hour to see a specialist. It may not be a single consult kinda deal so better to get on it early as possible.
Secondly, while you’re waiting for that to go through, read up on pec tears online via google. There’s different kinds, some being more severe than others, with different prognoses. It’s usually a long arduous road back most of the time but it’ll help the process if you know what you are getting into.
Bit early given you’ve no diagnosis or started a rehab/management plan but if you chuck us an update on how you’re doing in a few weeks it’s probably a good idea to have a think about contributing factors to your injury so we can avoid it in future.
Good luck.