Should i sue my ex employer for harment and discrimination?

for three years i worked as a security guard on a team pre dominantly made up of white australian, i joined the team on an aboriginal trainee-ship and was excited to learn but over the course of my employment i found that several of my colleagues including my supervisor where racist against aboriginal people. at first i didn't let it bother me, i ignored it and continued with my work. but eventually it started to bother me and i ended up becoming withdrawn and quite at work. but this made me look weak and as a result i became a target of my supervisor who would like to critise and har me about every detail of my job. i got a written warnings for small peddy stuff like being 5 mins late and told i'd be sacked if i was late again, i got sent home for one day of facial hair growth, i got continually got accussed of stuff that i didn't do until eventually i couldn't take it any more and started fighting back and sticking up for myself. but then the slander and racial comments behind my back started before i knew it everyone at work hated me. i became every more withdrawn and then i started getting set up for stuff by my supervisor who especially had it in for me, i got repremanded for crap that wasn't my fault. eventually i dicided to write a written complaint and get every thing out on paper. the HR department done a brief investigation and told me that action would be taken to prevent the harasement continuing and i foolishly believed. after that i had a target on my back and my supervisor who got repremanded was now out to do every thing to try and get rid of me. but he was smart he got all the big bosses on his side and then started just digging on me with small peddy stuff and embarrasing me infront of my colleagues. on several occasions i tryed to tell the big bosses what was goin on but they sided with my supervisor until eventully i snaped and told my supervisor to get ******. he then made a writen complaint against me and got me stood down even though i was prevoked. by this stage i felt like i was going to have a nervous break down so i resigned and have spent the last 5 mounths in my house dejected and depressed. i have no self esteem and i can't dicide wether or not i should take this to court or not. i don't know if i'll win or just create more stress for myself.