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Hi there.Thank you for your question.I will be helping you out with your concerns today.I am sorry to hear about your problem.
Unfortunately the only way he can get a clearance letter that is going to be accepted is to see a doctor face-to-face or in-person.
Any letter provided online is not going to be accepted firstly because most of the doctors on this site are overseas registered like for instance I am registered practitioner in Australia but if I give you an online letter it would not be accepted in Australia.
So you would have to see a doctor in-person.
I am sorry that we cannot be of any help.
Let me know if you have any other things that I can help you out with or any questions that you may have.