My life is such a mess, how can i make it better?

so im 24 with no qualifications living in the UK. i have a 3 and a half year old daughter, im separated from her mum for about 3 years were friendly towards each other 99% of the time but we will never get back together. i live in a small horrible 1 bed apartment, i work nights in a supermarket because i need the extra money nights provide but i absolutely hate it! but i can only just scrape by with the money i get from it. about 4 months or so ago i found a new girlfriend and i fell deep in love with her she was perfect and made me more happy than ive ever been, she gave me such energy and i loved to do things id normally hate and the stuff i loved to do was so much better with her. before we got together she had already agreed to work in a summer camp for disabled kids in the USA for 12 weeks, this was fine we both knew it was coming and said we would stay together and skype or email everyday untill a few days ago she phoned me and told me she had been offered the job of her dreams and after the summer camp she could stay on for an extra 18 months and travel America looking after the disabled kids she loves. now i told her i really thought she should do this job as its a once in a life time job only problem is she didnt want to stay with me because its near 2 years for her to be on the other side of the world. when she told me that i didnt cope with it well and told her a lot of silly things in desperation to keep her i wasnt thinking clear and was some what in shock and it really put me off her totally, so she broke up with me and said we could be friends and email once in awhile but we'd never get back together. so now im suck sliding in to depression in a job i hate, with no money, with a daughter i love but means i cant change my lifestyle and ive seemingly lost what i know was the love of my life, i never believed in "the one" untill i met her. all i wanted from her was to try and make a go of the long distance relationship but by the time i got to the point of telling her that i had already put her off, so i dont know what to do? id think more in depth about suicide than i already have but i cant do that to my daughter. so im just stuck and dont know what to do, i have no close friends or family to talk to about this i was talking to my resent ex's mum and she was great but my ex understandable flipped out about it. anyone help me? please dont be rude im feeling fragile and i know there are a lot of people who have it worse than me i just dont want to be miserable any more.