There is a minor error of a missing ' in your columns of the INSERT statement (
VALUES($pfn'), but also there is also a problem of matching the columns up. I would normally list the columns that I am inserting into as well, something like...
$this->db->query("INSERT INTO add_clinic (`Patient Full Name`, *** ) VALUES('$pfn','$pe','$pmn','$pa','$pw','$ph','$pgt','$pbp','$pec')");
(Where *** is just a list of the columns to be inserted into).
There are two recommendations I would like to make - firstly is to change the names of your columns. Having spaces in column names can cause all sorts of problems and is not normally recommended.
Secondly is to look into using prepared statements and bind variables, this will provide all sorts of benefits later, including security and not having problems with certain characters in the text.