I’m sorry to hear you are going through this. Its very stressful, my only advice is to try to approach calmly and methodically and consider all options, there may or may not be cracks you can use as pivot points to regain at least partial access to Proton, or some of your other important accounts, or at least minimize the damage.
I nearly got myself into a circular trap like this a while ago when I was robbed. I was able to (mostly) claw my way back out of it, but only barely and partially due to luck, and after weeks of being locked out of everything, there are about a dozen accounts I still can’t access (due to 2fa).
As you rebuild your digital life, be very mindful of your current experience, and try to use it as a learning experience to improve your backup and redundancy strategy. I went with 3 hardware keys (one on me, one backup nearby and a second backup a 100+ kilometers away) + another weaker form of 2FA as a backup.