It depends on what type of issues you have. If it's Waswasa related to worship then please refer to the following article and thread which are full of help and advices to help overcome Waswasa related to worship:
However if it is related to other mental issues then you should see a professional Mental Health expert. Keep asking if Allah for help and assistance and know he will never abandon you. This is a test for you and he tests those he wants good for. So fear not and put your trust, reliance and faith in him. Continue with all your 5 daily prayers and pray Tahajjud at night. Ask of him and know that he hears your every prayer.