i used to hear voices and hallucinate, I've hallucinating , I've just graduated, completed my degree and landed a great job this month,but instead of being happy and smiling about it , I feel so low and lost , I don't know if i want to work or do anything,i ended up arguing with my best friend, I've known him since nursery and i was so angry at everything, I've never been to the doctor or anything for this,but uts getting worse, I would like to seek help but i don't know if this is normal or this something that needs attention and require meds or therapy, please help ,any comments and any messages would be appreciated, if it matters I'm a 26 year old Male from Uk ,any advice would help please,

Thank you in advance, I have a really low mood at the moment,i should be very happy yet i don't know how to feel happy,i am grateful for everything and everyone who supported me through my tough times at uni and getting jobs and financially, I'm especially grateful for my girlfriend who puts up with my stupid rants and moods, I don't know how to deal with anything anymore ,any advice at all would be really appreciated.