Can I abruptly stop using Minoxidil 2% after 2 weeks? It caused massive shedding and headache. Will the shedded hair grow back?

Hair loss from depakote has been well documented.  You should meet with your prescribing doctor and find an alternative (hopefully you discussed stopping it with your doctor already!).  Your hair will likely grow back over a 6 month period.  If not you should see a specialist in...

Given your young age, and the extent of your balding, it would be wise to wait many years before ever considering a hair transplant. In the mean time I would suggest 5% minoxidil over the 2% as it is more effective. The use of finasteride would also be very important. PRP and laser...

You need to follow up with your doctor if you believe you are having a side effect.  It seems you have multiple issues such as scalp psoriasis.  

If you had a bald spot for over 6 years, it probably will remain bald for life.  You can try Rogaine as you don't need a doctor's prescription to try it.  However it is unlikely it will give you a significant change.

This is something that requires a doctor to evaluate. Women lose hair from a variety of causes, including birth control pills as you already found out. The work-up is extensive, not something that can be done over the internet and requires a doctor who knows about female hairloss.

Based on the history and the pictures which have been attached ( though more are required), it seems you are suffering from Male Pattern Baldness. The first line of management will include a visit to a hair specialist and then start off with medical therapy in the form of Finasteride, Minoxidil...