Stuff,
Remember, dating websites are an adjunct to meeting someone in real life. Don't try to completely try to get to know someone on the internet, it doesn't work. Truly getting to know someone requires frequent communication, honesty, and trust. First dates should always take place in public and phone communication should be done when both people are ready to share information.
I always ask up front what the person expects in terms of and the frequency of the communication, it's not like you can read another persons mind. Also, sometimes guys like to be pursued too. Believe it or not, it shows confidence and really gets a guy thinking. Please realize there are good websites out there and decent men. One caveat, if anyone who tells you they are not dealing with an issue or doesn't have a problem stay away because they are not being honest with you.
Also, no one has to know about your PTSD unless you tell them and that's later on in a relationship. If they choose not to accept that you have that condition, then they are not the right one for you. I am male, am actively involved in dating websites, and share the same frustrations as you do. Online dating takes work, patience, and doesn't happen overnight.
Keep in mind too not to put so many roadblocks up, I admit, I am guilty of that. It's just as difficult for men as it is for women to date. On websites, we're all constantly scanned for one thing or another. It can be looks, how many kids a person has, something that was taken out of context in an email, or just as simple as a certain type of music a person listens too. Male or female, everyone wants someone to hold at night even though we may be too anxious, on guard, or hypervigilant at times. Worry seems to compound on other worries.
If it makes you feel better I was told I was too honest and emotionally receptive one time by a female. Now you would figure that would be something a person would want, right? Next girl told me she would date me because I was not a vegetarian. Sorry if I don't grow a vegetable garden in my backyard. But I do love my country music and kids.
Have basic expectations of your ideal mate, but don't have too high expectations. Do what makes you happy and remain positive, you deserve it. And if something doesn't work out, celebrate because at least you made an effort.