The email would not have contained your cell phone number unless you specifically put it IN the email. Otherwise, they would have had to find out your phone number from some other source.
They MIGHT have used your email to contact you via iMessage, if you were using that email as your Apple ID. You can turn off iMessage in Settings > Messages.
Thank you. It doesn't look like an imessage because it is in green bubbles not blue like my imessages always use. Moreover, when I reply to it - it says sms not "imessage".
I am still weirded out by the whole experience and not sure what happened or how they were able to text my cellphone from an email.
Might us my computer in the future when dealing with "strangers". At least it will help protect my privacy.
I do indeed use that email as my apple ID so you were smart to show me how to turn that off. Thank you