Knocking under hood and low oil pressure?

For the past week or so I have noticed a knocking sound coming from under the hood. It isn't always present. When I first start the van I hear nothing, then after about 5-10min I hear it occassionally. When it is present it gets faster when I accelerate and slower when I let off the gas. Also for the past 2... show more For the past week or so I have noticed a knocking sound coming from under the hood. It isn't always present. When I first start the van I hear nothing, then after about 5-10min I hear it occassionally. When it is present it gets faster when I accelerate and slower when I let off the gas. Also for the past 2 days I have been getting a low oil pressure notice as well. The van only has 67,500 miles on it so I am not sure what could be going on. I know I need an oil change, but am only 100 miles past due and plan on getting one this weekend. Any ideas? I am really stressing about this
Update: Sorry, It is a 2008 Chevy Uplander
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