Hi I Have Been Experiencing Fog Headed Nausea And Not

Hi i have been experiencing fog headed nausea and not sleeping i get about 2 hours a night .i have been codiene free for 3months witch i took to sleep 70mg a night for 5 years now i take nothing i feel good just insomnia is getting me down i cant take it anymore
I have tried calmitives .melitonon. lavander hot baths everything natural nothing is working. I exercise 1hour every morning dr have told me im depressed. Could i be depressed or just had enough of no sleep