"I had lower and upper eyelid surgery done 3 1/2 months ago. My doctor removed too much fat and I have sunken hollow eyes. I also have ectropion in one eye along with chemosis..." - I am truly sorry to hear of your predicament but it sounds to me like you are rushing head long into another complication. For the absolute best revision results all traces of inflammation must be gone and the eyelid tissue must be supple. Operating before 5-6 months have passed invites miscalculation and further and worse complications.
An ectropion is the eversion and loss of contact of the rim of the lower lid with the eyeball. It can be caused by multiple processes or combination of processes such as tissue weakness (INVOLUTIONAL), scar tissue (surgery, injury, burn, lasers- CICATRICIAL) and, or by eyelid muscle paralysis. In your case, it is probably due to either one or all three of these processes. IF the chemosis is caused by the process(es) causing the ectropion, repair of the ectropion should also correct the chemosis.
Fat grafting of the eyelids in the best of hands is a 50-50 proposition. When fat is placed in the lower lids and is not quickly supported and nourished by a blood supply, the fat dies leading to palpable nodules and reappearance of the hollowed look supplemented by a bunch of bumps. No one way of treating fat and grafting the fat has completely solved this problem. So - it is hard to say how long the fat will live except to say that if it does live, it will remain alive for years. The challenge is in getting all or most of the fat to survive.