It will not hurt you legally to leave H's stuff alone. It might hurt you legally to do otherwise. Wait for legal counsel. You might also want to get legal counsel before you get a better paying job. It may put you in a worse position. I believe that in most states, H CANNOT remove you from his health insurance without your permission. I'd also skip the menacing text that could be taken as a threat. It won't help you legally and could hurt you legally.
You are doing great. There is nothing to reply to. Stay busy, get some legal support. You need to know: what is the best way to get the best financial settlement if you D?; what can you do to guarantee financial support during separation?; how can you protect yourself from H's mounting debt? what can you do to prevent H from bringing his GF to your home? (For instance, can you file a suit against her? If so, perhaps you can tell H and his GF that if she enters your home again that you will do so.)
