I trust that you have done the obvious things like checking your spam folder etc.
You can do 2 things at this point.
1) Raise a case specific enquiry with the subject line as "
Urgent".
The URL for CSE
https://dmp-portal.cic.gc.ca/enquiries-renseignements/case-cas-eng.aspx?mission=new%20delhi
2) Make a telephonic enquiry (or meet them) to the designated medical practitioner. Quote your UCI number and see if they can look up your IME number. If they can look it up, you are safe. You should be able to take medicals without medicals sent by VO.
I assume that the visa officer may have missed out emailing the medical request that they may have created.
Initiate point 1 immediately and Can you try point 2 and let me know the outcome?