Storm damage

We had some very high straight winds yesterday, and especially so in the evening and night - gusts of 50 -60 mph and more.  Shortly after supper we heard a big sound on the roof and saw some roof shingles laying on the ground.   Harold got up on the ladder and on the roof (yes, in the wind!) and took a board up there and used screws to hold the weak spot in place.  About an hour later, we heard more shingles ripping.  All night long we heard our roof shingles going away in pieces while the fierce winds raged on.   Then the rain started.   We woke up to this:

A big section of our roof shingles are gone.

Upon inspection this morning, it looks like one corner, the southeast corner of the roof, is bare of shingles.   We are guessing that one corner might have been a little loose, and then pretty soon the whole corner went, piece by piece.  The tar paper is still there.  So, it looks like we have to do some roof repair asap!  We don't need this, ya know?  I'm sure Harold can get someone to help him fix things.  We can't afford to hire anyone. 
     Update:  After looking things over today, it might be worse than we figured on.  There are shingles all over the yard, not just what is pictured here.   Now we need to make a decision about whether to repair, or to replace the whole roof. Whether we replace with shingles or metal, we're talking big $$$$$$.