Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
I suggest you, kindly follow up with one particular doctor and do not take opinions of so many people like family nurse etc. 20 day antibiotic is not followed anywhere unless you require admission and it is that serious. I think you might be having sinusitis. Get appropriately treated for the same. That may be the cause of your giddiness. One you are cured of sinusitis even your giddiness may subside. If you have a simple
sinus infection, your doctor may recommend you use a decongestant and saline nasal washes. You shouldn’t use an over-the-counter decongestant more than 3 days, though, because it can make you more congested. If your doctor gives you antibiotics, you’ll probably take them for 10 to 14 days. The symptoms usually disappear with treatment. Warm, moist air may help if you have
chronic sinusitis. You can use a vaporizer, or you can inhale steam from a pan of warm water. Make sure the water isn't too hot.
There are some other things you can do yourself to help with chronic sinusitis:
1) Warm compresses can ease pain in the nose and
sinuses.
2) Saline nose drops are safe to use at home.
3) Over-the-counter decongestant drops or sprays can help. Don’t take them longer than recommended.
4) You also need to avoid any triggers linked to your sinusitis.
Hope I have answered your query.
Let me know if I can assist you further.