HELP ME PLEASE!

I AM A 66 YEAR OLD MAN, 5' 6" TALL, WHO HAS UNDERGONE KNEE REPLACEMENT AND OTHER SURGERIES, LIVE ON SOCIAL SECURITY AND DOING ODD JOBS WHEN I CAN. I WAS RECENTLY ATTACKED BY A MAN IN THE PARKING LOT OF A MOTEL WHERE I WAS STAYING WHEN OUT OF TOWN HELPING SOMEONE WITH WORK. WHILE IN MY PAJAMAS AT MY VEHICLE CHARGING MY PHONE AFTER TALKING WITH MY WIFE FOR OVER AN HOUR. THIS MAN WAS TWICE MY SIZE AND 20 YRS YOUNGER. I FEARED FOR MY LIFE AS HE STRUCK THE SIDE OF MY TRUCK AND THEN ATTACKED MY PERSON. A PHYSICAL STRUGGLE ENSUED, WE FOUGHT AND HE FORCED ME TO THE GROUND KICKING MY CHEST, RIBS AND HEAD. THE ONLY THING I COULD GET MY HAND ON TO DEFEND MYSELF WAS A UTILITY KNIFE. I STRUGGLED, BUT WAS ABLE TO STRIKE HIM IN THE SIDE WITH THE BLADE ON THE TOOL AS HE CAME DOWN TO PUNCH ME ONCE AGAIN WITH HIS FISTS. HE BACKED OFF AND I WAS FINALLY ABLE TO GET TO MY FEET, KEEPING MY EYES ON HIM AS HE WALKED TOWARD THE MOTEL. I THEN CALLED THE LOCAL POLICE AND AN AMBULANCE. I GAVE THE POLICE MY REPORT OF THE EVENTS AND WAS ASKED IF I WANTED TO PRESS CHARGES. I SAID NO; AS I WAS JUST GRATEFUL TO BE ALIVE AND THAT THE WORST DIDN'T HAPPEN TO EITHER OF US. I WAS SHAKEN AND IN SHOCK. THE POLICE LEFT ME, BUT LATER CAME BACK AND ARRESTED ME FOR ASSAULT. THIS BULLY OF A MAN TOLD THE POLICE THAT I TRIED TO ROB HIM! IT WAS A COMPLETE LIE. I SPENT 13 DAYS IN JAIL WITHOUT ANY MEDICAL ASSISTANCE, I SPENT ALL THE MONEY I HAD FROM THE WORK I HAD JUST FINISHED TO POST BAIL, I WAS DENIED A PUBLIC DEFENDER, EVEN THOUGH MY SS INCOME IS LOW AND AM NOW FORCED TO STAND TRIAL AND PLEAD MY CASE. LEGAL FEES ARE ESTIMATED TO BE $15,000, WHICH I DON'T HAVE. I'M ASKING FOR ANYONE TO HELP ME WITH ANY AMOUNT THEY CAN AFFORD. I MUST SHOW UP IN COURT IN OCTOBER WITH PAYMENT FOR MY ATTORNEY; OTHERWISE, I DON'T KNOW WHAT WILL HAPPEN. MY WIFE AND I ARE A NORMAL RETIRED COUPLE, LIVE A QUIET LIFE WITH OUR FOUR PETS, AND JUST LIVE TO SEE OUR GRANDCHILDREN WHEN WE CAN. I'VE TRIED TO HELP FAMILY AND OTHERS ALL MY LIFE, TRIED TO ALWAYS BE POLITE AND CONSIDERATE, AND NEVER BEEN IN ANY TROUBLE. PLEASE HELP ME DEFEND MYSELF! THANK YOU FOR READING MY STORY.