Welcome to HCM.
If it is your upper lid which is sagging,that could be causing your blurring of vision in that eye.
And regarding that swelling, it could be two things.
which in the beginning is painless but its red.
2. Allergic lid edema and conjunctivitis
which is accompanied by itching .
Try giving warm compresses (10-15 mins) and a dose of oral anti allergic tablet along with anti inflammatory for a day.
If its not coming down , then consult your ophthalmologist in your area. Avoid rubbing your eyes till then.
Take care :).