What is the proper meaning of this ? emoji?

I’m not feeling well ? I haven’t even started my assignment that is due tomorrow! ? I am freaking out because of the coronavirus ? Just got off a rollercoaster and feeling a little queasy ? I shouldn't have had that last drink last night ? The heat is really getting to me today ? This math problem has me feeling dizzy ? I've been studying for hours and my brain is fried ? I can't believe I stayed up so late binge-watching that show ? After a long night of drinking, someone might send a message saying "? I'm so hungover today." If someone is feeling overwhelmed with work or school, they might say "I have so much to do, ? I don't know where to start." If someone is feeling dizzy or lightheaded, they might say "I'm feeling a bit ? today, I think I need to lie down."