Yes you definitely can make decisions at this time but that doesn't mean you won't change them later. I think it's important to talk to someone else about this because these are some big decisions. You could tell them your plans, what you want in life, and let them see if it all makes sense (and it should). Just because you're not in the happiest of moods doesn't mean your thinking is impaired - in fact, it might be the opposite because you're now aware of what makes you satisfied and what doesn't! So don't give up on yourself, trust your gut (+ logic) and good luck!