Help me see my children

I am a divorced father who lives 2400 miles from my children.  After child support and alimony, I barely have enough to break even after paying rent and food.  I save money by not having a TV, limiting any driving (I bus to work and walk 3.5 miles home), using coupons, doing free things for entertainment, etc.  I, by all standards, bring home less than someone who makes minimum wage (after paying my obligations to my kids and ex).  Being a good father, I left the house for my kids and their mom to live in.  Over 80% of my paycheck after taxes goes to them.

It is impossible for me to save enough money to even see them once a year.  The last time I was able to see them was in October 2013.

Though I have been granted equal visitation, I haven't been able to either go and see my kids in Ohio nor have them be able to visit me in Washington.

I love and miss my children dearly.  I have two daughters; who are 15, and 12 and a son who just turned 8.  My youngest has Cystic Fibrosis and was recently hospitalized.  I was unable to visit him while he was there for a two week stay because of the lack of funds for a plane ticket, rental car and hotel.

I am desperate to see them and have hesitated to ask for help, but feel as if I have no other choice.  Thank you for your kindness and consideration of helping a father see his kids.