Vulcan Welcome to FlyerTalk and to the QR forum. You may find the dashboard a useful tool.

45 minutes is the minimum possible connection time so you have no time to dawdle. Look at the Wiki on the dashboard widget About DOH Airport this together with it links gives you a great deal of advice and hints. Of particular help will be the link to the Wiki on Short connections at DOH (under 90 minutes).

As you will see Preparation is the key to a relaxed transfer.