You might be having allergic reactions triggered by your exercise. When you do certain workouts at the gym, like lifting weights or floor exercises, your eye swells up. This could be due to allergens at the gym or materials from the equipment. It's good that outdoor activities don't cause this problem. To prevent the symptoms, try wearing protective eyewear (goggles) at the gym or using antihistamine eye drops before you work out. It's a good idea to consult with an allergist for a complete evaluation and management plan.

Nidhi’s eye swelling incident might be due to sinusitis, which is caused by acute inflammation of the sinuses. This occurs when the sinus passages are blocked or infected. The swelling is happening due to the presence of the fluid. You can put a warm towel on your eye and also drink plenty of water to help reduce the swelling.

The symptoms you are experiencing, may or may not be linked to the dosage of sertraline. It is better to consult with a eye doctor for proper evaluation 

Aapke bhai ki aankh mein jo takleef hai woh samajh sakta hoon. Jis tareeqe se operation hua hai, kuch waqt lag sakta hai aankhon ke theek hone mein. Dhoondh la nazar aana aksar thoda time leta hai, lekin naye lenses dalne se dekhnay ki salahiyat behtar ho sakti hai. Yeh zaroori hai ke aap doctor se follow-up karne jayein, taake wo puri tarah se jaanch lein aur koi aur advice de sakain. Aapke bhai ko behtar mehsoos karne mein yeh madadgar hoga.