If you were a PAYE worker in 2007 and you sold shares in 2007, you would need to complete a CG1 form for 2007. The 2007 version of this form is currently not available on the Revenue.ie website but should be on it around March next.
If you sold the shares at the beginning of 2007 and you have a liability arising from this, payment of this liability should have been made to Revenue by 31st October 2007.
As regards claiming medical expenses for 2007, this can be done online. See the Revenue.ie homepage for details of how to do this.