I would really like to know who was controlling KTPA (Approach) tonight. My callsign was Frontier 315, and I would like to apologize for my actions during my arrival. I just had this very big brain fog hit me. I felt a little bit off starting at the departure, but it really hit me come arrival. It resulted in me making stupid mistakes: I forgot my left to my right, I was unable to multitask with throttle/heading/altitude, and once I accidentally left the frequency. I hope I did not cause much stress on your end. Last of all, I would also like to thank you for showing patience with me and helping me get to the approach for the ILS.