A lot of people use Fox Farm Light Warrior for starting seeds. You can really use any cheap top soil as long as it doesn't have a lot of bark in it. (Bark just causes problems as it impedes root growth in some instances and doens't hold moisture very well.) Also, if you look, many times you can find soil labeled seed starter; often it is in smaller print.
I love FFOF, you just have to wait until your plants get established better. Too much of a good thing too soon.
Keep your FFOF and mix it with some light warrior if you get it or any soil or peat, etc. about a 50/50 ratio should be good enough for starting seeds.
If you're curious. I mix up roughly equal parts of FFOF, Roots Organic, Earth Worm Castings, and Coco Coir; plus other smaller portioned ingredients. I've started seeds in this with no problem.
Just calm down and take a breath. I know it sucks and you can't really help but feel frantic, but that's not going to help anything. Calm....