You can use subspace while there as well, that allows you to sit right next to the practioner.
Don't know where to get individual frequencies, here what is in Consolidated Annotated Frequency List (CAFL):
Parasites_roundworms_comp - 7159, 5897, 4412, 4152, 3212, 2720, 2322, 1372,
1113, 1077, 1054, 942, 835, 827, 826, 822, 799, 776, 773, 772, 753, 752, 749,
746, 738, 732, 728, 722, 721, 698, 688, 650, 543, 541, 535, 422, 380, 332, 240,
200, 152, 128, 120, 112, 104, 101, 20
Parasites_roundworms_general - 7159, 5897, 4412, 4152, 3212, 2720, 942, 835,
827, 772, 732, 721, 688, 650, 543, 422, 332, 240, 152, 128, 120, 112, 104, 20
Parasites_roundworms_general_short_set - 128, 152, 240, 422, 650, 688
BTW: 738 with a fuzz (moves around by 0.333) worked best for me yesterday, whatever that means...