I cannot honestly think of any professional, even advocates of "crying it out," who would recommend allowing a 7 week old to cry for 2 hours. Your baby is simply too young to be "trained" in this manner.
For some reason many babies go through a fussy period from around 6 weeks to 3 months old, where it gets completely impossible to figure out what is making them cry. One theory I've heard is sensory overload, but I don't think the cause really matters. Understand that is completely normal for an infant to suddenly change in reactions and expectations as they enter new developmental phases, and you simply do your best to cope. A lactation consultant I worked with used to call this early age fussy period the "witching hour." I actually became addicted to internet posting when my daughter was in her witching hour phase, because the only way I could keep from going insane after having tried every possible way to calm her was to put her on my lap in a boppy, and start chatting on the internet! She would cry, I would chat, and eventually the clicking of the keys in the darkened room would put her to sleep.
One possibility to eliminate is if your infant may be experiencing gas. Often gas causes the infant to become uncomfortable when laid down. If your baby seems happy when held upright, but cries when placed horizontally, gas would be something to consider.
More likely than not, however, this is simply a developmental issue. Comfort your infant through it anyway you can. Nothing will be gained at this age by pressing the schedule and asking her to cry it out.