I had my last vial of Humalog break tonight and I can't pick up the prescription anywhere in the middle of the night. The local 24hr. pharmacy will sell me Humulin R over the counter - I've never taken this drug. Any body have any suggestions on a sliding scale to use? Can I use Humulin R in my pump until the morning? Is Humalog rapid-acting and Humulin R just fast-acting? Please help!