Maddie needs some help!

Hi everyone for those who know me you know how difficult this is to ask for help. Maddie my 26 year old lesson horse has been suffering from bouts of colic. Luckily we have been able to catch it early and get the vet out. However since she has coliced 3 times in a month and a half. The next step is some extra diagnostic testing. As you all know I am not a wealthy person and work my butt off to take care of the horses. With Maddie's previous vet bills I cannot get get testing done until I get my vet bill paid down. So I hope that any of you can help out a bit, anything will help. The last month has been extremely difficult with Maddie and my rescue horse that I have been trying to find a home for. Sabrina the TB I rescued got injured in the pasture and had the vet out for her today as well. She got a puncher wound on her leg and was doing well with regular cleaning and antibiotics until she finnished her course of antibiotics. 2 days after the wound became infected. She is now on stronger antibiotics. I'm already stressing about that vet bill even though I haven't gotten it yet.