Header dissapears when i select single product

I messed around in the header.php settings because i thought i needed to ad a google tag to verify my website….I added a simple ssl plugin to secure my site, but because i dont really know wwhat i am doing i did not know about re-directing etc….now google ads is also blocking my ads as its still going to my http site and not my https site….i feel like crying….and now suddenly my header dissappears when i click on individual products….can some one help lee@tricstatshirts.com

The page I need help with: [log in to see the link]