Based on the information that you are having the recent headaches
with red eyes, it seems that "ALLERGY
TO POLLEN" is one of the major cause during the spring (march and April).
The changes in weather patterns is major cause of headache and are notice as seasonal changes, moreover the summer heat makes headaches more frequent.
Consult the near by physician if it becomes unbearable or below mentioned remedies do not work.
Use over the counter anti allergic eye drops, which will help in decreasing redness
try to wear protective eye were like sunglasses in heavy sunlight, avoid sun exposure at noon, take frequent break and keep your eyes shut for 5 min every 2 hours, sprinkle of cold
water into your eyes will help.
Hope it helps
Dr. JAY PATEL