Have you heard of the Flynn effect? How about musicality? Fluid or crystallized intelligence?
Flynn Effect: Yes. The Flynn Effect is always applied to national IQ Scores and not to individuals. Further, the Flynn Effect is thought to have essentially gone away in the developed nations--perhaps 30+ years ago. It still continues in the non-developed nations.
So,in short, the Flynn Effect does not apply to you as you are an individual, not a nation.
As to musicality and the others: You have raised a valid question which addresses the whole concept of intelligence and how it is measured. What you hae failed to do is to show that the question you have raised has any revelance to your comments about your IQ going from 100 to 149.
NOw, If you were at the second testing, tested by a test that measured those factors, you might have a point. However, if so you failed in you foundational statement due to the fact that you did not corelate the second test score with the first. As you probably well understand: If tested by a second difference test, you must corelate it with the first test score.
E.g. If one is tested once by the Stanford-Binet and the second by the WAIS, you must corelate the two in order to compare. NOTE: Neither of the tests that I have mentioned would measure musacility that you mentioned. To measure that you would have to have taken a highlly specialized test and corelate it to the WAIS, or watever you previously took.