Company bond

I recently joined an organization and it’s only been 7 months. They made my father sign a contract of indemnity to ensure I worked with them for two years. In other words they made me sign a bond indirectly. Due to the stress and workload of the job I developed health issues. I have nerve issues now due to which I can’t even walk properly and constantly feel like falling. I can’t work continuously every day of the week because after two continuous days, I’m so tired and physically exhausted that I can’t even get out of bed. I feel lethargic everyday and it’s effecting my performance and my morale as i got a feedback that due to my poor performance, the entire teams productivity is effected. I don’t wish to continue but I can’t afford to pay the bond amount. As it is, the pay offered is a measly 13k and when I tried to resign they asked me to pay an amount of 35k+. I’m undergoing treatment which is quite expensive and I don’t have any other financial support. What can I do?