JDA

Can Sri krishna's name be used alone as a mantra (Sri Krishna, Sri Krishna, sri Krishna, etc.)?

Hello, this is my first post and I have a question. Can Sri Krishna's name be used alone as a mantra? (such as Sri Krishna, Sri Krishna, Sri Krishna, etc.) I chanted his name many times last night and experienced great energy, and strange as it is I woke up with a headache this morning. Could someone please explain this as well? Thankyou