Gray divorce how do I avoid living in my kid’s basement? Me, 72F; 72M husband

How can I protect myself financially in a gray divorce? Husband (72 M) and I (72 F) celebrated 50th anniversary with our family in July. This month, husband moved out and is filing for divorce . We are both retired from full time jobs. Income is from Social Security (H $3.5K, me $1.8K monthly) and annuities. House has a $90K mortgage, $1900 payments. Husband has run up $7K on a credit card I didn't know about until now. I currently work part time at a school, which gives me $900/month for 7 months. I want to stay in the neighborhood where my children live! and where I have friends. TLDR How to protect myself financially in gray divorce?