modifying child support

I have a question in reference to modifying child support. I petitioned to have the support modified about 11/2 years ago and it was reduced ( I was looking to have it increased) It was not a significant reduction, $10 per month. At that time, I was claiming, I believe 7,000 per year, self employment. My paper income is now zero. I live in Ohio. My son, was diagnosed years ago with Asberger's Syndrome. We do not go to therapy.. he refuses. Last May 2, 2013, I withdrew him from traditional (public) schooling due to bullying which has had quite an impact on him mentally. I am now homeschooling (online k12) this year and what a difference.... He once locked him self in the bathroom at 7:30 am and took a sleep aid because of his fear to go to school... this was it for me... His father sees him (lives a whole 15 mins away) approximated 4 times per year, give or take. I am now spending most of my day homeschooling and trying to instill some self-esteem back into my 13 year old son. With that said, would the above change in circumstances support a reason to have the child support modified? Increased? The father's earnings are somewhere in the ballpark of 70,000 annually... I would have to look. My earnings are imputed, hope that is the correct word. I need to be here for my son for school ( 6 plus hours daily) and support... trying to get him back on track.... Thank you for any advice...