Slow to send messages

For the past coupe of months, I have been having major problems each time a try to send a message to any group in my Civicrm. Everytime I try and send a test message, the timer wheel just spins on the page and it never goes through. Everytime I end up just sending the message out, my own account which is on the group never receives the email even though the report says that 100% of the messages were sent. And more and more members tell me that the message ends up in their Spam folder even though it hadn't previous times. What do I need to do to resolve this? I've invested a lot of time in setting up my database here and if I cannot send a message to my organization's mailing list Civicrm has very little use for our group.

Thanks,
Lauren
cell 347.403.4050
laurenmelodia@gmail.com