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I have gone through your reports (attachment removed to protect patient identity). Let me start by putting you at ease by saying that you are normal and your doctor has been doing a great job.
As you are near delivery, the skin stretches to its maximum and the tissue under the skin will start giving way. You will have stretch marks, but they will be further increasing, getting pinkish or redness. This itch will subside only after delivery when the stretch of the baby is relieved.
Another possibility is due to obstetric cholestasis. But this has been ruled out by the blood tests, so just relax and the danger has been eliminated. This cholestasis is due to the effect of progesterone hormone on the liver, leading to high levels of the liver byproducts.
To relieve itching the medications are right, and they do not have any significant interaction.
You can further reduce the itching by applying some local irritants like balms or onions juice. These will cause burning sensation, which will mask the itching.
About iron and hemoglobin, during the second trimester, every lady's hemoglobin will drop a bit as this is the time baby's blood volume suddenly expands. So, all iron and vitamins will be taken from your body. By last trimester the hemoglobin will improve on its own, as baby's blood is already ready.
These iron tablets will be absorbed from intestine and excess will not be taken in at all. As a result, your stools will be blacker.
To improve your hemoglobin, health and baby's health in the last trimester, have a lot of water, proteins, vitamins and sugar. These will also give you the energy needed for delivery.
The right amount of sugar (unless you already have diabetes) will make baby chubbier and healthier.
Somehow hold that itching till the 37th week, then delivery is the solution. There is no other solution.
For more information consult an obstetrician and gynaecologist online --> https://www.icliniq.com/ask-a-doctor-online/obstetrician-and-gynaecologist