Update: So this is what i cannot decide.. the graduate students are asking me 'ofh your advisor has left.. is he ok healthwise? or is it something else? but the truth is, i know as much as everyone else does.. which is nothing.. But I fear this makes me look like a complete fool,... like how do i not know what is going on with my pi.. In the meantime, I have meeting scheduled to talk to the DGS and also to another faculty member for taking over my advisor.
But on a completely different side note: I actually really miss my PI. We had a very good relationship, and he has been tremendously helpful.. sort of like a father figure. I m so confused.