I'm really stressed out what do i do?

hi i'm a 20 year old from san diego and lately my life has been going down hill. i don't know how to cope with all of this. a month ago my mom ped awya two weeks after she ped away i felt like i couldn't take care of my 5 month old baby by myself, so i called my bf mom so my son could go live with them for a while and she said yeah that she would be more than happy having him live with them for a bit. but she said that she didnt wanna be tracking me down every time she needed to take my son to the doctor and she said that my bf was always at work so that she needed to have parental custody to take him to doctors appoinments and i thought well that sounds ok maybe she does need to have custody to do thiss. but then she talked to her lawyer and she said she couldnt have custody so she told me to sign over custody to the fathe so i did. but i dont know what i was thinking i made a huge mistake and now they wont let me see him.. i feel terrible i cant sleep and i dont know what to do i want my baby back hes all i have left i miss him but i feel like i will never get him back. i talked to a lawyer and she told me that what my sons granmda did was taking advantage of me but i still feel like ill never get custody of my son back.. my life is so ****** up. i cant believe that a month ago everything was fine and now this is what became oof my life please i need someone to talk to. i dont like feeling this down..