ANSWER:
No, you cannot do tayammum if water is available.
You MUST fight this waswas, do the wudu once and just move away from the washbasin. Don’t let Satan have a field day at your cost, you’re making him laugh his head off by showering 5 times a day and spending so much time for wudu. You must defeat him.
You should ask someone to stand while you’re doing wudu everytime. You must not do it alone or in the washroom, locking yourself up, this will make satan play with your mind. When someone is standing and watching you do wudu, you would feel embarrassed to keep repeating it and in sha Allah, with the leave of Allah, you would be rid of this OCD very soon.
Kindly refer to the following link(s):
PROTECTION:
You must maintain your 5 daily prayers on time without fail.
Maintain your daily adhkar of morning and evening, before going to bed, after every fard prayer, while entering the washroom, while going out of the house, before eating etc and this will act as a shield against everything evil with the Mercy of Allah. You will find these duas in a booklet called ‘Hisnul Muslim’ or ‘Fortress of the Muslim.’
RUQYA FOR CURE: