Hi and welcome!

I understand your concern! Wow, exam AND party , that's a tough one.
First of all, the withdrawal symptoms are very individual and it's impossible to tell how you will react. I did not feel so horrible at all, but I was tired and irritable.
I'd say - do lots of research, stay here with us and begin when the stress is fairly over. I would do that. Some weeks don't matter much and 27th june is not so far away - I'm sure once you begin you'll have a great success.
This forum is great when it comes to support and advice, surf it as much as you can. Try my links below for example.
If you want to talk to me, just come by my journal, the yellow icon below.
Take care!
Alina