[Faceman]

Do you have ToB or an XP cap remover? If not it IS too late.
There may be enough XP in the game to get your abillities back at lvl16 but your total (first class + second class) XP maxes out at 2,950,000 XP in plain SoA.
So:
lvl 15 Berserker: 1,750,000
lvl 16 Cleric: 1,800,000
total: 3,550,000 which is higher than the XP cap
So if you don't have ToB or some XP cap remover your cleric half will be capped at lvl13.
.
If you do have ToB feel free to dual but try to do WK to regain your levels fast.