Treatment for grade 3 sprains should firstly include RICE (rest, ice, compress, elevate). Ice should be used for 15 minutes at a time and repeated every 3 hours throughour waking hours. Most people make the mistake of using it once or twice and thats it. You need to keep this up for at least 48 hours.
You need to start range of motion exercises firstly (like writing your name in the air with your toes) before starting gentle strengthening, like with a resistance (rehab) band.
You can find more info about sprained ankle here
Firstly you need to get it properly assessed by a doctor to determine the degree of damage to your ligaments.
It is important to regularly ice your ankle while it is still swollen. Taking some pain relief is really important too. There is not much point starting physio until the pain is under control.
A tubigrip sounds like it was given to you in hospital. It may hurt but helps to reduce the swelling.
I am a sports trainer and the first thing we do is ice the joint, apply compression, elevate the limb and refer for medical treatment.
Good luck with your recovery.
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ive had problems with my ankle for nearly 10 years and only just found out that 2 ligaments on outside of ankle are torn and the 1 on the inside of ankle is streched and they tryed physio and giving me arches for my shoes and none have worked so theres nothing else they can do (so they say) yet i lie in bed at night in pain i can be stood still and my ankle pops out at least 3-4 times a month its really anyoying.
ok i had had the same when i was in 8th grade in both my legs. now im going to go to 10th grade and it didnt heal still