In the name of cricket every body wil face the situation like this.
My General Advice is
Sewag should be dropped for a while to gain his techniques right. He should play varity of shots not the same he used to play and to confuse the bowler about his week ness.
Tendulkar should play at No 3 or 4. He has the capablity to rotaate the stikes
Munaf patel, Pathan know how to bowl in right line and lenth. One bad bowl leads to confidence of opponent teams.