You are only 26 years old. I don't know how many readings of BP were taken before you were put on Stamlo. I suggest you buy a BP instrument and record your BP at home atleast 3-4 times a day, one reading should be in the morning on getting up from bed. Then we decide if you have high BP or not.
Regarding the medicine you are taking for eye problems, they should continue and even your treatment for BP should continue.
Regarding your going to Gym and brisk walk, please share your BP record for atleast 5 days. Then we can decide.
Next Steps
Please consult a General Physician on Practo with all details.