Q. I have a thoroughbred gelding 8 years old that I rescued last year now he keeps having recurring absess in one hoof and discharge from nose
A. I would be curious to know if he is off track or not. OTTB (off track) horses often have damage done to their respiratory system as they may have been "winded" while running, others develop issues from being in the barn. I would have a vet check done to rule out any serious illness/injury but it is completely possible (depending on the type/severity) of the discharge that this is HIS normal.
Hoof abscesses can be difficult to manage and may take a lot of time. You will need the assistance of a good farrier to help rectify the problem. This may mean regular trims, cutting out the infected area, and general good hoof health practices. I would recommend a hot Epsom salt soak daily for a week. Use as hot of water as he will stand, in a bucket deep enough to cover the hoof with 1-2 cups of salt. This will help to draw out infection and hopefully burst the abscess. (Walmart sells a cheap big jug of Epsom salts.) You may need to pick up his other hoof to keep him standing with his foot in the bath. Soak 15-20 minutes/time. You can also try foot poultices from tack shops but I find the salt is as good as any fancy more expensive product you can use.
Just as a side note: are you 100% sure this is a hood abscess? There can be other injury further up the leg which may present as such. Just something to consider.
Good luck with him. You can get him sorted out and have a happy life together. Don't give up just yet.