Welcome to Lifecareayurveda
As per your query regarding heavy feelings in head and mild headach from a week.
And you also went out in sun with wet hair too.
As per this condition it needed to check out blood pressure too. and if its normal this is temporary problem with pitta and kapha.
You can be cure with the following treatment
1. Pathyadi ghanvati 2 tabs twice a day
2. Shir: shooladi vajra ras 2 tabs twice a day
3. Avipattiakr tab 2 tabs twice a day
4. Trifla gugal 2 tabs twice a day.
Please also apply the following ayurveda panchkarma treatment for quick relif if needed;
1. Nasya karma
2. Shirodhara treatment
Dr. Nikul Patel