Cheat Edit

In the savegame directory (game??), use some hex editor on GAMEINFO.SAV file. Offset 155 is your vitality, 157 your max vitality (for the impatient, replace 155-159 with e7 03 e7 03 - gives you 999 hit points, more will crash the game).

Your companions are in there, too... same procedure.

0623 for your first character
0AF2 for your second character
0FC1 for your third character