Oh yes, I have had exactly the same problem! I got scant sympathy or information when I contacted Forceval to ask when capsules might be available again. Customer service told me that 'it is quite normal to experience nausea after taking Forceval' despite my saying that it was the smell and the taste of the soluble product that was making me gag. They had me fill in an 'adverse reaction' form in which I was quite blunt about the revolting nature of the soluble product. Despite reassurances that capsules would be available at the end of August we are heading into mid September with the same message displayed on the Forceval website saying that there is a 'manufacturing delay'. It took weeks before they even bothered acknowledging that there was a problem.
The best advice you are likely to get on a substitute product is to visit the pharmacy department of your best independent chemist (Boots are rather random with their helpfulness). They will be able to recommend the next best thing for you, because if you are anything like me, you will have had to steel yourself more and more to even open the lid on the tube of Forceval soluble, without gagging.