Unplanned workload - clients in financial difficulty

It's 'tough going' in our area, and now, a lot of small businesses that have been holding on, hoping for recovery, are now really struggling and giving up.

We have spent a lot of time helping these clients, and haven't charged for the additional time reviewing in-year accounts, or for the additional meetings. We are coping with the additional workload at the moment, but if this increases it will affect the service I can give my fee-paying clients, which wouldn't be good for my practice.

I just worry that the situation is going to get worse and worse, as even previously profitable businesses are now calling me, wanting meetings to discuss their worries.

How do you deal with this situation? I cannot abandon them, but I don't feel I can add to their worries by charging for the additional services and support.