Over coming Insecurities.

Everyone goes through stages in their life where everything is at a happy medium. We are just cruising through life, keeping busy and moving forward.
And then what happens when we have a low and let insecurities take over us? When we start letting our negative thoughts control our lives. 
Feeling insecure is one of the worst feelings in the world, and when you are feeling low it is very hard to overcome the feeling of loosing the person who means the most to you. So how do us females deal with this - we push them away with our constant need of reassurance! This can go on to be a very vicious cycle all because of low self confidence. 
What are some ways you deal with feelings of insecurity during the dark time?