I can't see a reason for you to sue at this time. If the other party's insurance company doesn't deal fairly with you, then you might want to sue, but definitely not yet.
Unfortunately having to deal with life's troubles isn't necessarily justification for a law suit. As the injured (not-at-fault) party, you are entitled to repair of, or replacement of (Blue-Book value), your vehicle and the cost of a rental car while you are out the use of your vehicle (if it is being repaired), or until the company makes you a reasonable offer to settle the property damage portion. You can also demand damages for his loss of work, medical and pain and suffering (which he is also entitled to - you are not). If the company is paying for the vehicle replacement, that's the bulk of your damages from what you've said. Demand that the insurance company also pay you for the rental car expense, his lost wages, & double his medical costs incurred (for actual medical & P&S) in order to settle. Most likely they will settle with you for that & they will be glad no attorney is involved. Be thankful that your husband wasn't hurt & give him a big hug & tell him so.