Subconscious anxiety? how to cure it without medication?

For the past three weeks or so, I haven't been sleeping well nor eating well. I used to get nausea for periods of time but that has ceased. I have had insomnia and I only get around 4-5 hours a sleep per night now, I used to get 3 or so.
I don't want to go back on medication because I was thrown on Lexapro and that messed me up worse.
I feel some of this is subsonscious because I don't find myself really worrying about anything.
I'm in college, senior year, so I suppose that has something to do with it. I also feel this is a relapse because I had something like this two/three years ago which involved a panic attack and I was agoraphobic and I beat that myself, without the help of a therapist etc.
What can I do now? I couldn't afford to go on medication due to poor medical insurance but there's got to be something I can do. It's affected my heartbeat as well and I don't feel right. I've been getting bad tension headaches and I can't live on OTC medicine like advil.
I hope all of this goes away so I can be myself again...