Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. consult a Psychiatrist for a detailed assessment. It is likely with medication and counseling the symptoms will improve.  If you are feeling suicidalnor hopeless consult a Psychiatrist immediately.

I understand your situation. More clarity is needed regarding your problem. From whatever you have mentioned looks like you have emotionally unstable personality traits including indecisiveness, emptiness etc. Information regarding your sleep, hunger, energy levels and concentration at whatever you do would be more helpful to decide on the severity of your condition. However it is easily manageable with appropriate treatment. Some therapy sessions and if needed medical help might be useful for you. I would also be more than happy to help you with that if you are looking for online assistance. Discussions will be held confidential. You can directly consult with me through Practo as needed. Online chat consultation is available.