Professor stopped responding to emails suddenly. What should I do?
You have options. 

You could wait and hope. The person is probably pretty busy right now. 

You could try again, but I'd recommend against flooding the person with too many mails or too much information at a given time.

You could cast a wider net and try a few other professors at other places. 

You could give up. 

You could use some combination of the above. But casting a wider net is likely your best option, even in combination with others.